<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header class="home-header">
      <div>
        <img src="../assets/heima.png"
             alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info"
                 @click="logout">退出
      </el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside width="200px">
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744"
                 text-color="#fff"
                 active-text-color="#409EFF"
                 :default-active="activePath"
                 unique-opened
                 router>
          <!-- 一级菜单 -->
          <!-- index 只接收字符串不接收数值  而item.id是数值  ----  item.id拼接一个空字符串 === 字符串 -->
          <el-submenu :index="item.id + ''"
                      v-for="item in menulist"
                      :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconobj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subitem.path"
                          v-for="subitem in item.children"
                          :key="subitem.id"
                          @click="saveNavState('/'+subitem.path)">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subitem.authName}}</span>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 页面占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // iconfont 图标数据
      iconobj: {
        "125": 'iconfont icon-users',
        "103": 'iconfont icon-tijikongjian',
        "101": 'iconfont icon-goodsfill',
        "102": 'iconfont icon-baobiao',
        "145": 'iconfont icon-data',
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear()
      // 跳转到登录页
      this.$router.push('/login')
    },
    // 获取左侧所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      console.log(res)

      if (res.meta.status !== 200) return this.$message.error('res.meta.msg')
      this.menulist = res.data
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
  }
  span {
    margin-left: 15px;
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
</style>